Description du sujet de thèse

This thesis topic is part of the ANR ORACLE project, which brings together several partner laboratories (LPC2E, ICARE, and CEMHTI in Orléans, GSMA in Reims). The project aims to improve our understanding of atmospheric chemical composition and the associated physicochemical processes related to the formation and evolution of aerosols, particularly organic aerosols, up to the stratosphere. The doctoral student will contribute to the experimental and analytical study of atmospheric constituents collected during balloon sampling campaigns. The work will include participation in experimental balloon campaigns, the acquisition of in situ atmospheric data, and laboratory analysis of samples using high-resolution mass spectrometry (DESI/Orbitrap, HPLC/Orbitrap). Additional characterization of collected aerosol particles using techniques such as scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS), synthesis and interpretation of results, and writing scientific reports and international publications.

Contexte de travail

The candidate must have solid knowledge of physical chemistry and analytical chemistry, a strong interest in experimental work, combined with scientific rigor, skills in processing and analyzing experimental data, an aptitude for working in multidisciplinary teams, and the ability to communicate results (oral, written, article writing). The thesis will be carried out mainly at the LPC2E laboratory (Laboratory of Physics and Chemistry of the Environment and Space, CNRS, Orléans) in close collaboration with ICARE (Institute of Combustion, Aerothermal Reactivity and Environment). Exchanges will also take place with CEMHTI (Conditions Extrêmes et Matériaux: Haute Température et Irradiation, Orléans) and GSMA (Groupe de Spectrométrie Moléculaire et Atmosphérique, Reims). The LPC2E is a joint research unit under the supervision of the CNRS, the University of Orleans, and the CNES. The LPC2E brings together three scientific teams, one of which is dedicated to the physical chemistry of the Earth's atmosphere. The laboratory draws on the technical team's strong expertise in instrumentation (mass spectrometry and infrared lasers, aerosol counters, hygrometers, electrical and magnetic sensors, etc.), including the design, production, implementation, and use of data from instruments on the ground or carried aboard aircraft, balloons, and satellites.
These skills are internationally recognized, as evidenced by the laboratory's participation in numerous projects for space and environmental agencies. ICARE is a CNRS-affiliated unit attached to the Engineering Department, whose main research topics are Combustion and Reactive Systems, the Atmosphere and the Environment, and Space Propulsion and Atmospheric Reentry. The laboratory is composed of 8 researchers, 15 teacher-researchers, 15 ITA staff, and around 30 doctoral and postdoctoral students. The position is in a sector subject to scientific and technical potential protection (PPST) and therefore, in accordance with regulations, requires your arrival to be authorized by the competent authority of the MESR. The doctoral student will participate in inter-laboratory experimental activities and scientific follow-up meetings for the ORACLE project. Laboratory analysis experiments will take place at ICARE.

Contraintes et risques

None